Expansible pulley



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HlFHALL.

EXPANSIBLB PULLBY. No. 431,889. l PatentedJuly 8, 1890.

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H. P. HALL. llt EXPANSIBLE PULLBY. N0. 431,889. Patented July 8, 1890.

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UNITED STATES PATENT HARRY F. llAiTi, PI-.l`LADELPIllA, FENNSYLVANTA.

EXP'ANSIBLE PULLEY.

SPECIFIGATIN forming part of Letters Patent No. 431,889, dated J ul y 8, 1890.

Application filed March 4, 1890. Serial No. 342,565. (No model.)

To a/ZZ whom it may con/cern.-

Be it known that I, HARRY F. HALL, a citizen of the United States, residing in the city and county of Philadelphia, State of 'Pennsylvania, haveinvented a new and useful lmprovelncnt in Expansible Wheels or Pulleys, which improvement is fully set forth in the following specification and accompanying drawings.

My invention relates to improvements in expansible wheels or pulleys; and it consists of a wheel er pulley having an inclined side and provided with a sleeve having pivoted arms with heads, the latter adapted to move in radial lines on said inclined. eide.,

It further consists of the.combination of parts herein set forth.

Figure l represents a side view of a device embodying my invention. Fig. 2 represents a plan view of the device shown'in Fig. l, the top of one of the ways of a sliding arm being broken away. Fi 3 represents a vertical section on line a: w, Fig. 2. Fig. 4 represents a vertical sectional view en line y y, Fig. 2. Fi 5 represents a perspective view of one et the pivoted arms with head and block.

Similar letters of reference indicate corresponding parts in the several figures.

Referring to the drawings, A designates an eXpansible pulley secured en the shaft B, the latter being suitably journaled in the standards C. One side of the pulley is beveled or inclined from the hub D te the periphery E, and in the same are formed the grooves F, extending radially to the periphery and of dovetail form. A sleeve G is keyed to the shaft B, so as to rotate therewith and have a lateral movement thereon. lmbracing the sleeve G is a yoke ll, provided with two laterally-extending arms J, the ends of which move in ways or guides K, supported by the standards L. To one end of the sleeve G is pivotally secu red the radially-extending arms M, which carry the hinged or pivoted heads N, having the grooves I thereon. A dovetail bleek Q is connected with each of the heads N, and is fitted in a radial groeve F, se as to be adapted to slide therein, the side of the block Q adjacent te the grooved head N being inclined and flush with the side of the pulley A.

To move the arms J in the ways K, the following described. mechanism is employed: A rotary shaft R, which is journaled 1n the gear-wheels T T, which mesh, respecth'ely, with two bevel gear-wheels U U, secured on the rotary screw-rods V V. The said rods V V are journaled in bearings on the standards L, and the screw-threaded parts thereof work in the nuts V, which are located in the slots or recesses X in the arms J.

Power may be communicated to the pulley A in any suitable manner. In the mechanism shown in thedrawings a grooved driving-[mlley Y is connected with the sliding heads N of the expansible pulley A by the ropes 7*., the said pulley Y being mounted on a shalt A', which is rotated by means of the gear-wheels B and C', the latter mounted on a shaft l) and provided with a crank-handle lil.

A tension device for taking up the slack of the ropes Z consists of `a greeved drum er pulley looselyT mounted on a shaft l1", the latter having the sliding bearings G', adapted to rise and fall on ways on the uprighl's ll.

The manner ol' operating the device is as follows: Power having been communicated to the pulley A from the driving-shaft A by means of the pulley Y and ropes Z, if it be desired to change the speed of the said pulley A and its shaft the shaft R is rotated by means of the driving-wheel J', with crank arm thereon, on the said shaft, so that the bevel-gears T T, meshing with the bevel-gears lU U, rotate the screw-rods V V, thereby mov ing the nuts lV endwise on the said rods, and thus moving the arms J en the guides er ways K. This motion of the arms J causes the yoke HandA sleeve (1l tol slide en the shaft l, so

to said sleeve, either recede from er approach toward the hub ef the pulley A, according to the direction of the rotation of the Wheel J If the sleeve G is approaching the hub D, the heads N will be forced or moved outward toward the periphery of the pulley, thus increasing the diameter ol' the part thereof which receives power from the d riv ing-pulley, and thereby decreasing` the speed of the pulley A and its shaft. I l' the sleeve D recedes from the hub, the effect is to di standards S, has mounted thereon two bevel t that the ends of the radial arms M, piveted' minish or lessen the diameter of the pa t of the pulley directly connected with the f riving-pulley, and thereby increase the speed of the shaft of the expansible pulley.

By the mechanism herein described the speed of any machine can be readily changed, either increased or diminished, Without stopping the machine orof shifting belts from one pulley to another.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, isy 1. The combination of a shaft, a pulley, a series of heads connected with and movable on said pulley and adapted to carry bands y thereon, a sleeve on said shaft, arms con nected with said sleeve and heads, a yoke with laterally-extending arms, and screws connected with each of said arms for simultaneously moving said arms, substantially as described.

2. The combination of a pulley having grooves in one of its sides, a movable sleeve, and arms pivotally connected with said sleeve and carrying grooved heads to receive a belt and provided with blocks, the latter being pivotally attached to said heads and moving in said grooves of the side of the pulley, said parts being combined substantially as described.

3. The combination of a pulley having radial grooves in one of its sides, a sleeve with arms pivoted thereto and carrying pivoted heads with grooved outer faces to receive a belt, said heads having blocks pivotally connected therewith and movable in the said grooves of the pulley, and mechanism, substantially as described, 'cr moving said sleeve to and from said pulley,substantially as and for vthe purpose set forth.

4. The combination of a pulley having radial grooves on one of its sides, a sleeve with arms pivoted thereto, heads having grooved outer faces to receive a belt and pivietally connected with said arms and provided with blocks movable in said grooves, a yoke emi bracing said sleeve and having laterally-pro Jeeting arms, and' rotative screws, substantially as described, connected with said arms and adapted to move the same simultaneously either to or from the pulley, substantially as and for the purpose set forth.

5. The combination of a pulley havinglradial grooves in an inclined or beveled side thereof, a sleeve with arms pivoted thereto, heads pivoted to said arms and having blocks guided in said radial grooves, a rotary shaft on which said pulley and sleeve are keyed, and rotative screws, substantially described, connected with said sleeve for moving the same either to or from the pulley, substantially as and for the purpose set forth.

G. The combination of a shaft, a pulley and a sleeve on said shaft, arms pivotally connected to said sleeve and provided at their outer ends with pivoted heads, and a rotative screw, substantially as deseribed,ioi moving said sleeve either to or from said pulley, the said heads being adapted to move on. radial lines of said pulley and in contact therewith, substantially as and for the purpose set forth.

7. rlhe combination of a pulley having a grooved side, a sleeve with pivoted arms and. heads thereto, a yoke embracing said. sleeve and having latei':.tllypi-ojecting arms, guides for said arms, rotary screw-rods adapted to move said arms, and a rotary shaft with bevelgearing meshing with bevel-gearing on said rotary screw-rods, substantially as described.

S. The combination of a pulley with an inclined side, having lradial grooves therein, a sleeve with arms pivoted thereto, heads pivoted to said arms and provided with blocks secured thereto and movable in said grooves, a shaft on which said pulley and sleeve are keyed, a yoke embracing said sleeve and having laterally-projecting arms, ways in which said arms are guided, rotary screiv-rods passr ing through nuts located in slots in said arms, bevel gear-wheels on said rods, and a rotary shaft having bevel-gearing meshing with the bevel-gearing on said screw-rods, substantially as and for the purpose set forth.

9. A pulley with an inclined orbeveled side, a sleeve with pivoted arms, a shaft on which said pulley and sleeve are keyed, heads pivoted to said arms and in contact with said inclined side and adapt-ed to move in radial lines thereon, and mechanism, substantially as described, connected with said sleeve for moving the same either to or from the pulley, said parts being combined substantially as and for the purpose set lorth.

10. A pulley with an .inclined or beveled side and having radial grooves therein, a sleeve with arms pivoted thereto, a shaft on which said pulley and sleeve are keyed, h eads pivoted to said arms and having means connected therewith for moving in the line of said radial grooves, a yoke embracing said sleeve and having projecting arms, and mechanism, substantially as described, for moving said arms simultaneously either to or from the pulley, said parts being combined substantially as described.

, HARRY F. HALL.

Witnesses:

JOHN A. WInDERsnEn/I, WM. C. WIEDEnsnnn/t. 

